On the basis of the SITE algorithm

this paper proposes a node coverage discrimination model based on the average distance of neighbor nodes（ADDM）for wireless sensor networks

which discriminate whether a certain node is redundant or not by computing the average distance between this node and all the neighbor nodes and the central angle of the overlapping area.Theoretical analysis and simulation results show that the ADDM improves the SITE algorithm

overcomes its failure to consider the contribution of those nodes with distances longer than radius of perception in covering redundant nodes

thus realizing the regional coverage with fewer nodes

reducing the number of active network nodes and prolonging the network life time.